Which of the Following Was Not a Reason for the Success

Multiple Choice

Which of the following was not a reason for the success of Muhammad and his followers in spreading Islam?

A) The faith was simple to explain and to understand.
B) Believers were promised an eternal reward for their faithfulness.
C) Islam's moral and ethical code attracted many who disliked the dissension of Christianity and the complexities of Judaism.
D) The Five Pillars of Faith were easier to hold to than were the Ten Commandments.
E) The doctrine of salvation that Muhammad preached gave believers a single, living God who promised never to fail them.